[Q] Why can't the Nexus use the Google Play Music external storage feature

Update v5.3.1316M of Google Play Music introduced using external storage for your music data. You go into Settings > Downloading > Storage Location and it will show external storage if you have it. It works on many devices with SD card slots like the S4.

I have a USB key over OTG with my Nexus. Using Stickmount or the latest ES File Explorer; the key mounts, I see it at /data/media/0/usbStorage/sda1/, /sdcard/usbStorage/sda1 and /storage/sda1, I can read and write files, it doesn't show up under Settings > Storage, and I can't select it in Google Play Music. I'm assuming something like the Meenova would show the exact same issue.

Anyone know why this is a Nexus issue? Anyone know where the sdcard is mounted on working devices? Has anyone used a ROM that works with Google Music and OTG?

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